如何设置 RSS 类型的通知服务？
背景：我在 iOS 和 Android 上设置了一个 PhoneGap 应用程序，其中的插件允许我在应用程序处于后台时对系统/本地通知进行排队。我知道如果应用程序退出或终止，或者自安装/开机后尚未启动，它将无法工作，但这些并不是太重要。
我想要做的是创建一个数据库来保存通知（与应用程序名称关联），并让应用程序定期（5 分钟？）向服务器发出 getJSON 请求（jQuery）并检索任何通知。
我想知道的是 - 如何让设备知道应该从服务器提取哪些通知，而无需重复通知？我是否需要存储设备检索到的每个通知的 ID 以确保它不会重复？这似乎会在设备上存储大量不必要的数据，并且如果清除本地数据可能会变得混乱。我想这会像 RSS 一样发挥作用，因为它会获取最新的信息，但不会重复。
Background: I have a PhoneGap application set up on iOS and Android with plugins that allow me to queue system/local notifications when the app is in the background. I know that it won't work if the app was quit or killed, or if it hasn't been started since install/power on, but these are not too important.
What I want to do is create a database that will hold notifications (associated with an app name), and have the app periodically (5 minutes?) do a getJSON request (jQuery) to the server and retrieve any notifications.
What I want to know is - how can I make the device know which notifications it should pull from the server, without ever duplicating one? Do I need to store the id of every notification the device has ever retrieved to ensure it doesn't get duplicates? This seems like it would store a lot of unnecessary data on the device and could get messed up if local data is cleared. I guess this would function like an RSS in that it would get the most recent info, but not duplicate.
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